Question: What was the member of the Holy See on 1973-6-25?
Paraphrase: Who was the member of the Holy See on 1973-6-25?
SPARQL (Wikidata): SELECT ?obj WHERE { wd:Q159583 p:P463 ?s . ?s ps:P463 ?obj . ?s pq:P580 ?x filter(contains(YEAR(?x),'1973')) }